we got ldap with CN=usersgroup OU=Accounts,OU=Groups

usersgroup having mapping to all users i.e usersgroup is member of all users.
i am able assign permission at usersgroup.by making search by: cn, search name: usersgroup its listing usersgroup.

if i need to assign permission to OU=Accounts and CN= contains list of all users how to do it ?

help appreciated .
thanks in advance